1 ba97b2d7 2024-03-20 stsp /*
  2 ba97b2d7 2024-03-20 stsp  * Copyright (c) 2024 Stefan Sperling <stsp@openbsd.org>
  3 ba97b2d7 2024-03-20 stsp  *
  4 ba97b2d7 2024-03-20 stsp  * Permission to use, copy, modify, and distribute this software for any
  5 ba97b2d7 2024-03-20 stsp  * purpose with or without fee is hereby granted, provided that the above
  6 ba97b2d7 2024-03-20 stsp  * copyright notice and this permission notice appear in all copies.
  7 ba97b2d7 2024-03-20 stsp  *
  8 ba97b2d7 2024-03-20 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 ba97b2d7 2024-03-20 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 ba97b2d7 2024-03-20 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 ba97b2d7 2024-03-20 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 ba97b2d7 2024-03-20 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 ba97b2d7 2024-03-20 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 ba97b2d7 2024-03-20 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 ba97b2d7 2024-03-20 stsp  */
 16 ba97b2d7 2024-03-20 stsp 
 17 ba97b2d7 2024-03-20 stsp #include <sys/types.h>
 18 ba97b2d7 2024-03-20 stsp #include <sys/queue.h>
 19 ba97b2d7 2024-03-20 stsp #include <sys/tree.h>
 20 ba97b2d7 2024-03-20 stsp #include <sys/socket.h>
 21 ba97b2d7 2024-03-20 stsp #include <sys/wait.h>
 22 ba97b2d7 2024-03-20 stsp 
 23 ba97b2d7 2024-03-20 stsp #include <errno.h>
 24 ba97b2d7 2024-03-20 stsp #include <event.h>
 25 ba97b2d7 2024-03-20 stsp #include <siphash.h>
 26 ba97b2d7 2024-03-20 stsp #include <limits.h>
 27 ba97b2d7 2024-03-20 stsp #include <sha1.h>
 28 ba97b2d7 2024-03-20 stsp #include <sha2.h>
 29 ba97b2d7 2024-03-20 stsp #include <signal.h>
 30 ba97b2d7 2024-03-20 stsp #include <stdio.h>
 31 ba97b2d7 2024-03-20 stsp #include <stdlib.h>
 32 ba97b2d7 2024-03-20 stsp #include <string.h>
 33 ba97b2d7 2024-03-20 stsp #include <imsg.h>
 34 ba97b2d7 2024-03-20 stsp #include <unistd.h>
 35 ba97b2d7 2024-03-20 stsp 
 36 ba97b2d7 2024-03-20 stsp #include "got_error.h"
 37 ba97b2d7 2024-03-20 stsp #include "got_path.h"
 38 ba97b2d7 2024-03-20 stsp 
 39 ba97b2d7 2024-03-20 stsp #include "gotd.h"
 40 ba97b2d7 2024-03-20 stsp #include "log.h"
 41 ba97b2d7 2024-03-20 stsp #include "notify.h"
 42 ba97b2d7 2024-03-20 stsp 
 43 ba97b2d7 2024-03-20 stsp #ifndef nitems
 44 ba97b2d7 2024-03-20 stsp #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
 45 ba97b2d7 2024-03-20 stsp #endif
 46 ba97b2d7 2024-03-20 stsp 
 47 ba97b2d7 2024-03-20 stsp static struct gotd_notify {
 48 ba97b2d7 2024-03-20 stsp 	pid_t pid;
 49 ba97b2d7 2024-03-20 stsp 	const char *title;
 50 ba97b2d7 2024-03-20 stsp 	struct gotd_imsgev parent_iev;
 51 ba97b2d7 2024-03-20 stsp 	struct gotd_repolist *repos;
 52 ba97b2d7 2024-03-20 stsp 	const char *default_sender;
 53 ba97b2d7 2024-03-20 stsp } gotd_notify;
 54 ba97b2d7 2024-03-20 stsp 
 55 ba97b2d7 2024-03-20 stsp struct gotd_notify_session {
 56 ba97b2d7 2024-03-20 stsp 	STAILQ_ENTRY(gotd_notify_session) entry;
 57 ba97b2d7 2024-03-20 stsp 	uint32_t id;
 58 ba97b2d7 2024-03-20 stsp 	struct gotd_imsgev iev;
 59 ba97b2d7 2024-03-20 stsp };
 60 ba97b2d7 2024-03-20 stsp STAILQ_HEAD(gotd_notify_sessions, gotd_notify_session);
 61 ba97b2d7 2024-03-20 stsp 
 62 ba97b2d7 2024-03-20 stsp static struct gotd_notify_sessions gotd_notify_sessions[GOTD_CLIENT_TABLE_SIZE];
 63 ba97b2d7 2024-03-20 stsp static SIPHASH_KEY sessions_hash_key;
 64 ba97b2d7 2024-03-20 stsp 
 65 ba97b2d7 2024-03-20 stsp static void gotd_notify_shutdown(void);
 66 ba97b2d7 2024-03-20 stsp 
 67 ba97b2d7 2024-03-20 stsp static uint64_t
 68 ba97b2d7 2024-03-20 stsp session_hash(uint32_t session_id)
 69 ba97b2d7 2024-03-20 stsp {
 70 ba97b2d7 2024-03-20 stsp 	return SipHash24(&sessions_hash_key, &session_id, sizeof(session_id));
 71 ba97b2d7 2024-03-20 stsp }
 72 ba97b2d7 2024-03-20 stsp 
 73 ba97b2d7 2024-03-20 stsp static void
 74 ba97b2d7 2024-03-20 stsp add_session(struct gotd_notify_session *session)
 75 ba97b2d7 2024-03-20 stsp {
 76 ba97b2d7 2024-03-20 stsp 	uint64_t slot;
 77 ba97b2d7 2024-03-20 stsp 
 78 ba97b2d7 2024-03-20 stsp 	slot = session_hash(session->id) % nitems(gotd_notify_sessions);
 79 ba97b2d7 2024-03-20 stsp 	STAILQ_INSERT_HEAD(&gotd_notify_sessions[slot], session, entry);
 80 ba97b2d7 2024-03-20 stsp }
 81 ba97b2d7 2024-03-20 stsp 
 82 ba97b2d7 2024-03-20 stsp static struct gotd_notify_session *
 83 ba97b2d7 2024-03-20 stsp find_session(uint32_t session_id)
 84 ba97b2d7 2024-03-20 stsp {
 85 ba97b2d7 2024-03-20 stsp 	uint64_t slot;
 86 ba97b2d7 2024-03-20 stsp 	struct gotd_notify_session *s;
 87 ba97b2d7 2024-03-20 stsp 
 88 ba97b2d7 2024-03-20 stsp 	slot = session_hash(session_id) % nitems(gotd_notify_sessions);
 89 ba97b2d7 2024-03-20 stsp 	STAILQ_FOREACH(s, &gotd_notify_sessions[slot], entry) {
 90 ba97b2d7 2024-03-20 stsp 		if (s->id == session_id)
 91 ba97b2d7 2024-03-20 stsp 			return s;
 92 ba97b2d7 2024-03-20 stsp 	}
 93 ba97b2d7 2024-03-20 stsp 
 94 ba97b2d7 2024-03-20 stsp 	return NULL;
 95 ba97b2d7 2024-03-20 stsp }
 96 ba97b2d7 2024-03-20 stsp 
 97 ba97b2d7 2024-03-20 stsp static struct gotd_notify_session *
 98 ba97b2d7 2024-03-20 stsp find_session_by_fd(int fd)
 99 ba97b2d7 2024-03-20 stsp {
100 ba97b2d7 2024-03-20 stsp 	uint64_t slot;
101 ba97b2d7 2024-03-20 stsp 	struct gotd_notify_session *s;
102 ba97b2d7 2024-03-20 stsp 
103 ba97b2d7 2024-03-20 stsp 	for (slot = 0; slot < nitems(gotd_notify_sessions); slot++) {
104 ba97b2d7 2024-03-20 stsp 		STAILQ_FOREACH(s, &gotd_notify_sessions[slot], entry) {
105 ba97b2d7 2024-03-20 stsp 			if (s->iev.ibuf.fd == fd)
106 ba97b2d7 2024-03-20 stsp 				return s;
107 ba97b2d7 2024-03-20 stsp 		}
108 ba97b2d7 2024-03-20 stsp 
109 ba97b2d7 2024-03-20 stsp 	}
110 ba97b2d7 2024-03-20 stsp 
111 ba97b2d7 2024-03-20 stsp 	return NULL;
112 ba97b2d7 2024-03-20 stsp }
113 ba97b2d7 2024-03-20 stsp 
114 ba97b2d7 2024-03-20 stsp 
115 ba97b2d7 2024-03-20 stsp static void
116 ba97b2d7 2024-03-20 stsp remove_session(struct gotd_notify_session *session)
117 ba97b2d7 2024-03-20 stsp {
118 ba97b2d7 2024-03-20 stsp 	uint64_t slot;
119 ba97b2d7 2024-03-20 stsp 
120 ba97b2d7 2024-03-20 stsp 	slot = session_hash(session->id) % nitems(gotd_notify_sessions);
121 ba97b2d7 2024-03-20 stsp 	STAILQ_REMOVE(&gotd_notify_sessions[slot], session,
122 ba97b2d7 2024-03-20 stsp 	    gotd_notify_session, entry);
123 ba97b2d7 2024-03-20 stsp 	free(session);
124 ba97b2d7 2024-03-20 stsp }
125 ba97b2d7 2024-03-20 stsp 
126 ba97b2d7 2024-03-20 stsp static uint32_t
127 ba97b2d7 2024-03-20 stsp get_session_id(void)
128 ba97b2d7 2024-03-20 stsp {
129 ba97b2d7 2024-03-20 stsp 	int duplicate = 0;
130 ba97b2d7 2024-03-20 stsp 	uint32_t id;
131 ba97b2d7 2024-03-20 stsp 
132 ba97b2d7 2024-03-20 stsp 	do {
133 ba97b2d7 2024-03-20 stsp 		id = arc4random();
134 ba97b2d7 2024-03-20 stsp 		duplicate = (find_session(id) != NULL);
135 ba97b2d7 2024-03-20 stsp 	} while (duplicate || id == 0);
136 ba97b2d7 2024-03-20 stsp 
137 ba97b2d7 2024-03-20 stsp 	return id;
138 ba97b2d7 2024-03-20 stsp }
139 ba97b2d7 2024-03-20 stsp 
140 ba97b2d7 2024-03-20 stsp static void
141 ba97b2d7 2024-03-20 stsp gotd_notify_sighdlr(int sig, short event, void *arg)
142 ba97b2d7 2024-03-20 stsp {
143 ba97b2d7 2024-03-20 stsp 	/*
144 ba97b2d7 2024-03-20 stsp 	 * Normal signal handler rules don't apply because libevent
145 ba97b2d7 2024-03-20 stsp 	 * decouples for us.
146 ba97b2d7 2024-03-20 stsp 	 */
147 ba97b2d7 2024-03-20 stsp 
148 ba97b2d7 2024-03-20 stsp 	switch (sig) {
149 ba97b2d7 2024-03-20 stsp 	case SIGHUP:
150 ba97b2d7 2024-03-20 stsp 		log_info("%s: ignoring SIGHUP", __func__);
151 ba97b2d7 2024-03-20 stsp 		break;
152 ba97b2d7 2024-03-20 stsp 	case SIGUSR1:
153 ba97b2d7 2024-03-20 stsp 		log_info("%s: ignoring SIGUSR1", __func__);
154 ba97b2d7 2024-03-20 stsp 		break;
155 ba97b2d7 2024-03-20 stsp 	case SIGTERM:
156 ba97b2d7 2024-03-20 stsp 	case SIGINT:
157 ba97b2d7 2024-03-20 stsp 		gotd_notify_shutdown();
158 ba97b2d7 2024-03-20 stsp 		/* NOTREACHED */
159 ba97b2d7 2024-03-20 stsp 		break;
160 ba97b2d7 2024-03-20 stsp 	default:
161 ba97b2d7 2024-03-20 stsp 		fatalx("unexpected signal");
162 ba97b2d7 2024-03-20 stsp 	}
163 ba97b2d7 2024-03-20 stsp }
164 ba97b2d7 2024-03-20 stsp 
165 ba97b2d7 2024-03-20 stsp static void
166 ba97b2d7 2024-03-20 stsp run_notification_helper(const char *prog, const char **argv, int fd)
167 ba97b2d7 2024-03-20 stsp {
168 ba97b2d7 2024-03-20 stsp 	const struct got_error *err = NULL;
169 ba97b2d7 2024-03-20 stsp 	pid_t pid;
170 ba97b2d7 2024-03-20 stsp 	int child_status;
171 ba97b2d7 2024-03-20 stsp 
172 ba97b2d7 2024-03-20 stsp 	pid = fork();
173 ba97b2d7 2024-03-20 stsp 	if (pid == -1) {
174 ba97b2d7 2024-03-20 stsp 		err = got_error_from_errno("fork");
175 ba97b2d7 2024-03-20 stsp 		log_warn("%s", err->msg);
176 ba97b2d7 2024-03-20 stsp 		return;
177 ba97b2d7 2024-03-20 stsp 	} else if (pid == 0) {
178 ba97b2d7 2024-03-20 stsp 		signal(SIGQUIT, SIG_DFL);
179 ba97b2d7 2024-03-20 stsp 		signal(SIGINT, SIG_DFL);
180 ba97b2d7 2024-03-20 stsp 		signal(SIGCHLD, SIG_DFL);
181 ba97b2d7 2024-03-20 stsp 
182 ba97b2d7 2024-03-20 stsp 		if (dup2(fd, STDIN_FILENO) == -1) {
183 ba97b2d7 2024-03-20 stsp 			fprintf(stderr, "%s: dup2: %s\n", getprogname(),
184 ba97b2d7 2024-03-20 stsp 			    strerror(errno));
185 ba97b2d7 2024-03-20 stsp 			_exit(1);
186 ba97b2d7 2024-03-20 stsp 		}
187 ba97b2d7 2024-03-20 stsp 
188 ba97b2d7 2024-03-20 stsp 		closefrom(STDERR_FILENO + 1);
189 ba97b2d7 2024-03-20 stsp 
190 ba97b2d7 2024-03-20 stsp 		if (execv(prog, (char *const *)argv) == -1) {
191 ba97b2d7 2024-03-20 stsp 			fprintf(stderr, "%s: exec %s: %s\n", getprogname(),
192 ba97b2d7 2024-03-20 stsp 			    prog, strerror(errno));
193 ba97b2d7 2024-03-20 stsp 			_exit(1);
194 ba97b2d7 2024-03-20 stsp 		}
195 ba97b2d7 2024-03-20 stsp 
196 ba97b2d7 2024-03-20 stsp 		/* not reached */
197 ba97b2d7 2024-03-20 stsp 	}
198 ba97b2d7 2024-03-20 stsp 
199 ba97b2d7 2024-03-20 stsp 	if (waitpid(pid, &child_status, 0) == -1) {
200 ba97b2d7 2024-03-20 stsp 		err = got_error_from_errno("waitpid");
201 ba97b2d7 2024-03-20 stsp 		goto done;
202 ba97b2d7 2024-03-20 stsp 	}
203 ba97b2d7 2024-03-20 stsp 
204 ba97b2d7 2024-03-20 stsp 	if (!WIFEXITED(child_status)) {
205 ba97b2d7 2024-03-20 stsp 		err = got_error(GOT_ERR_PRIVSEP_DIED);
206 ba97b2d7 2024-03-20 stsp 		goto done;
207 ba97b2d7 2024-03-20 stsp 	}
208 ba97b2d7 2024-03-20 stsp 
209 ba97b2d7 2024-03-20 stsp 	if (WEXITSTATUS(child_status) != 0)
210 ba97b2d7 2024-03-20 stsp 		err = got_error(GOT_ERR_PRIVSEP_EXIT);
211 ba97b2d7 2024-03-20 stsp done:
212 ba97b2d7 2024-03-20 stsp 	if (err)
213 ba97b2d7 2024-03-20 stsp 		log_warnx("%s: child %s pid %d: %s", gotd_notify.title,
214 ba97b2d7 2024-03-20 stsp 		    prog, pid, err->msg);
215 ba97b2d7 2024-03-20 stsp }
216 ba97b2d7 2024-03-20 stsp 
217 ba97b2d7 2024-03-20 stsp static void
218 ba97b2d7 2024-03-20 stsp notify_email(struct gotd_notification_target *target, const char *subject_line,
219 ba97b2d7 2024-03-20 stsp     int fd)
220 ba97b2d7 2024-03-20 stsp {
221 ba97b2d7 2024-03-20 stsp 	const char *argv[13];
222 ba97b2d7 2024-03-20 stsp 	int i = 0;
223 ba97b2d7 2024-03-20 stsp 
224 ba97b2d7 2024-03-20 stsp 	argv[i++] = GOTD_PATH_PROG_NOTIFY_EMAIL;
225 ba97b2d7 2024-03-20 stsp 
226 ba97b2d7 2024-03-20 stsp 	argv[i++] = "-f";
227 ba97b2d7 2024-03-20 stsp 	if (target->conf.email.sender)
228 ba97b2d7 2024-03-20 stsp 		argv[i++] = target->conf.email.sender;
229 ba97b2d7 2024-03-20 stsp 	else
230 ba97b2d7 2024-03-20 stsp 		argv[i++] = gotd_notify.default_sender;
231 ba97b2d7 2024-03-20 stsp 
232 ba97b2d7 2024-03-20 stsp 	if (target->conf.email.responder) {
233 ba97b2d7 2024-03-20 stsp 		argv[i++] = "-r";
234 ba97b2d7 2024-03-20 stsp 		argv[i++] = target->conf.email.responder;
235 ba97b2d7 2024-03-20 stsp 	}
236 ba97b2d7 2024-03-20 stsp 
237 ba97b2d7 2024-03-20 stsp 	if (target->conf.email.hostname) {
238 ba97b2d7 2024-03-20 stsp 		argv[i++] = "-h";
239 ba97b2d7 2024-03-20 stsp 		argv[i++] = target->conf.email.hostname;
240 ba97b2d7 2024-03-20 stsp 	}
241 ba97b2d7 2024-03-20 stsp 	
242 ba97b2d7 2024-03-20 stsp 	if (target->conf.email.port) {
243 ba97b2d7 2024-03-20 stsp 		argv[i++] = "-p";
244 ba97b2d7 2024-03-20 stsp 		argv[i++] = target->conf.email.port;
245 ba97b2d7 2024-03-20 stsp 	}
246 ba97b2d7 2024-03-20 stsp 
247 ba97b2d7 2024-03-20 stsp 	argv[i++] = "-s";
248 ba97b2d7 2024-03-20 stsp 	argv[i++] = subject_line;
249 ba97b2d7 2024-03-20 stsp 
250 ba97b2d7 2024-03-20 stsp 	argv[i++] = target->conf.email.recipient;
251 ba97b2d7 2024-03-20 stsp 
252 ba97b2d7 2024-03-20 stsp 	argv[i] = NULL;
253 ba97b2d7 2024-03-20 stsp 
254 ba97b2d7 2024-03-20 stsp 	run_notification_helper(GOTD_PATH_PROG_NOTIFY_EMAIL, argv, fd);
255 ba97b2d7 2024-03-20 stsp }
256 ba97b2d7 2024-03-20 stsp 
257 ba97b2d7 2024-03-20 stsp static void
258 ba97b2d7 2024-03-20 stsp notify_http(struct gotd_notification_target *target, const char *subject_line,
259 ba97b2d7 2024-03-20 stsp     int fd)
260 ba97b2d7 2024-03-20 stsp {
261 ba97b2d7 2024-03-20 stsp 	const char *argv[10] = { 0 }; /* TODO */
262 ba97b2d7 2024-03-20 stsp 
263 ba97b2d7 2024-03-20 stsp 	run_notification_helper(GOTD_PATH_PROG_NOTIFY_HTTP, argv, fd);
264 ba97b2d7 2024-03-20 stsp }
265 ba97b2d7 2024-03-20 stsp 
266 ba97b2d7 2024-03-20 stsp static const struct got_error *
267 ba97b2d7 2024-03-20 stsp send_notification(struct imsg *imsg, struct gotd_imsgev *iev)
268 ba97b2d7 2024-03-20 stsp {
269 ba97b2d7 2024-03-20 stsp 	const struct got_error *err = NULL;
270 ba97b2d7 2024-03-20 stsp 	struct gotd_imsg_notify inotify;
271 ba97b2d7 2024-03-20 stsp 	size_t datalen;
272 ba97b2d7 2024-03-20 stsp 	struct gotd_repo *repo;
273 ba97b2d7 2024-03-20 stsp 	struct gotd_notification_target *target;
274 ba97b2d7 2024-03-20 stsp 	int fd;
275 ba97b2d7 2024-03-20 stsp 
276 ba97b2d7 2024-03-20 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
277 ba97b2d7 2024-03-20 stsp 	if (datalen != sizeof(inotify))
278 ba97b2d7 2024-03-20 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
279 ba97b2d7 2024-03-20 stsp 
280 ba97b2d7 2024-03-20 stsp 	memcpy(&inotify, imsg->data, datalen);
281 ba97b2d7 2024-03-20 stsp 
282 ba97b2d7 2024-03-20 stsp 	repo = gotd_find_repo_by_name(inotify.repo_name, gotd_notify.repos);
283 ba97b2d7 2024-03-20 stsp 	if (repo == NULL)
284 ba97b2d7 2024-03-20 stsp 		return got_error(GOT_ERR_PRIVSEP_MSG);
285 ba97b2d7 2024-03-20 stsp 
286 ba97b2d7 2024-03-20 stsp 	fd = imsg_get_fd(imsg);
287 ba97b2d7 2024-03-20 stsp 	if (fd == -1)
288 ba97b2d7 2024-03-20 stsp 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
289 ba97b2d7 2024-03-20 stsp 
290 ba97b2d7 2024-03-20 stsp 	if (lseek(fd, 0, SEEK_SET) == -1) {
291 ba97b2d7 2024-03-20 stsp 		err = got_error_from_errno("lseek");
292 ba97b2d7 2024-03-20 stsp 		goto done;
293 ba97b2d7 2024-03-20 stsp 	}
294 ba97b2d7 2024-03-20 stsp 
295 ba97b2d7 2024-03-20 stsp 	STAILQ_FOREACH(target, &repo->notification_targets, entry) {
296 ba97b2d7 2024-03-20 stsp 		switch (target->type) {
297 ba97b2d7 2024-03-20 stsp 		case GOTD_NOTIFICATION_VIA_EMAIL:
298 ba97b2d7 2024-03-20 stsp 			notify_email(target, inotify.subject_line, fd);
299 ba97b2d7 2024-03-20 stsp 			break;
300 ba97b2d7 2024-03-20 stsp 		case GOTD_NOTIFICATION_VIA_HTTP:
301 ba97b2d7 2024-03-20 stsp 			notify_http(target, inotify.subject_line, fd);
302 ba97b2d7 2024-03-20 stsp 			break;
303 ba97b2d7 2024-03-20 stsp 		}
304 ba97b2d7 2024-03-20 stsp 	}
305 ba97b2d7 2024-03-20 stsp 
306 ba97b2d7 2024-03-20 stsp 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_NOTIFICATION_SENT,
307 ba97b2d7 2024-03-20 stsp 	    PROC_NOTIFY, -1, NULL, 0) == -1) {
308 ba97b2d7 2024-03-20 stsp 		err = got_error_from_errno("imsg compose NOTIFY");
309 ba97b2d7 2024-03-20 stsp 		goto done;
310 ba97b2d7 2024-03-20 stsp 	}
311 ba97b2d7 2024-03-20 stsp done:
312 ba97b2d7 2024-03-20 stsp 	close(fd);
313 ba97b2d7 2024-03-20 stsp 	return err;
314 ba97b2d7 2024-03-20 stsp }
315 ba97b2d7 2024-03-20 stsp 
316 ba97b2d7 2024-03-20 stsp static void
317 ba97b2d7 2024-03-20 stsp notify_dispatch_session(int fd, short event, void *arg)
318 ba97b2d7 2024-03-20 stsp {
319 ba97b2d7 2024-03-20 stsp 	struct gotd_imsgev *iev = arg;
320 ba97b2d7 2024-03-20 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
321 ba97b2d7 2024-03-20 stsp 	ssize_t n;
322 ba97b2d7 2024-03-20 stsp 	int shut = 0;
323 ba97b2d7 2024-03-20 stsp 	struct imsg imsg;
324 ba97b2d7 2024-03-20 stsp 
325 ba97b2d7 2024-03-20 stsp 	if (event & EV_READ) {
326 ba97b2d7 2024-03-20 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
327 ba97b2d7 2024-03-20 stsp 			fatal("imsg_read error");
328 ba97b2d7 2024-03-20 stsp 		if (n == 0) {
329 ba97b2d7 2024-03-20 stsp 			/* Connection closed. */
330 ba97b2d7 2024-03-20 stsp 			shut = 1;
331 ba97b2d7 2024-03-20 stsp 			goto done;
332 ba97b2d7 2024-03-20 stsp 		}
333 ba97b2d7 2024-03-20 stsp 	}
334 ba97b2d7 2024-03-20 stsp 
335 ba97b2d7 2024-03-20 stsp 	if (event & EV_WRITE) {
336 ba97b2d7 2024-03-20 stsp 		n = msgbuf_write(&ibuf->w);
337 ba97b2d7 2024-03-20 stsp 		if (n == -1 && errno != EAGAIN)
338 ba97b2d7 2024-03-20 stsp 			fatal("msgbuf_write");
339 ba97b2d7 2024-03-20 stsp 		if (n == 0) {
340 ba97b2d7 2024-03-20 stsp 			/* Connection closed. */
341 ba97b2d7 2024-03-20 stsp 			shut = 1;
342 ba97b2d7 2024-03-20 stsp 			goto done;
343 ba97b2d7 2024-03-20 stsp 		}
344 ba97b2d7 2024-03-20 stsp 	}
345 ba97b2d7 2024-03-20 stsp 
346 ba97b2d7 2024-03-20 stsp 	for (;;) {
347 ba97b2d7 2024-03-20 stsp 		const struct got_error *err = NULL;
348 ba97b2d7 2024-03-20 stsp 
349 ba97b2d7 2024-03-20 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
350 ba97b2d7 2024-03-20 stsp 			fatal("%s: imsg_get error", __func__);
351 ba97b2d7 2024-03-20 stsp 		if (n == 0)	/* No more messages. */
352 ba97b2d7 2024-03-20 stsp 			break;
353 ba97b2d7 2024-03-20 stsp 
354 ba97b2d7 2024-03-20 stsp 		switch (imsg.hdr.type) {
355 ba97b2d7 2024-03-20 stsp 		case GOTD_IMSG_NOTIFY:
356 ba97b2d7 2024-03-20 stsp 			err = send_notification(&imsg, iev);
357 ba97b2d7 2024-03-20 stsp 			break;
358 ba97b2d7 2024-03-20 stsp 		default:
359 ba97b2d7 2024-03-20 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
360 ba97b2d7 2024-03-20 stsp 			break;
361 ba97b2d7 2024-03-20 stsp 		}
362 ba97b2d7 2024-03-20 stsp 		imsg_free(&imsg);
363 ba97b2d7 2024-03-20 stsp 
364 ba97b2d7 2024-03-20 stsp 		if (err)
365 ba97b2d7 2024-03-20 stsp 			log_warnx("%s: %s", __func__, err->msg);
366 ba97b2d7 2024-03-20 stsp 	}
367 ba97b2d7 2024-03-20 stsp done:
368 ba97b2d7 2024-03-20 stsp 	if (!shut) {
369 ba97b2d7 2024-03-20 stsp 		gotd_imsg_event_add(iev);
370 ba97b2d7 2024-03-20 stsp 	} else {
371 ba97b2d7 2024-03-20 stsp 		struct gotd_notify_session *session;
372 ba97b2d7 2024-03-20 stsp 
373 ba97b2d7 2024-03-20 stsp 		/* This pipe is dead. Remove its event handler */
374 ba97b2d7 2024-03-20 stsp 		event_del(&iev->ev);
375 ba97b2d7 2024-03-20 stsp 		imsg_clear(&iev->ibuf);
376 ba97b2d7 2024-03-20 stsp 
377 ba97b2d7 2024-03-20 stsp 		session = find_session_by_fd(fd);
378 ba97b2d7 2024-03-20 stsp 		if (session)
379 ba97b2d7 2024-03-20 stsp 			remove_session(session);
380 ba97b2d7 2024-03-20 stsp 	}
381 ba97b2d7 2024-03-20 stsp }
382 ba97b2d7 2024-03-20 stsp 
383 ba97b2d7 2024-03-20 stsp static const struct got_error *
384 ba97b2d7 2024-03-20 stsp recv_session(struct imsg *imsg)
385 ba97b2d7 2024-03-20 stsp {
386 ba97b2d7 2024-03-20 stsp 	struct gotd_notify_session *session;
387 ba97b2d7 2024-03-20 stsp 	size_t datalen;
388 ba97b2d7 2024-03-20 stsp 	int fd;
389 ba97b2d7 2024-03-20 stsp 
390 ba97b2d7 2024-03-20 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
391 ba97b2d7 2024-03-20 stsp 	if (datalen != 0)
392 ba97b2d7 2024-03-20 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
393 ba97b2d7 2024-03-20 stsp 
394 ba97b2d7 2024-03-20 stsp 	fd = imsg_get_fd(imsg);
395 ba97b2d7 2024-03-20 stsp 	if (fd == -1)
396 ba97b2d7 2024-03-20 stsp 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
397 ba97b2d7 2024-03-20 stsp 
398 ba97b2d7 2024-03-20 stsp 	session = calloc(1, sizeof(*session));
399 ba97b2d7 2024-03-20 stsp 	if (session == NULL)
400 ba97b2d7 2024-03-20 stsp 		return got_error_from_errno("calloc");
401 ba97b2d7 2024-03-20 stsp 
402 ba97b2d7 2024-03-20 stsp 	session->id = get_session_id();
403 ba97b2d7 2024-03-20 stsp 	imsg_init(&session->iev.ibuf, fd);
404 ba97b2d7 2024-03-20 stsp 	session->iev.handler = notify_dispatch_session;
405 ba97b2d7 2024-03-20 stsp 	session->iev.events = EV_READ;
406 ba97b2d7 2024-03-20 stsp 	session->iev.handler_arg = NULL;
407 ba97b2d7 2024-03-20 stsp 	event_set(&session->iev.ev, session->iev.ibuf.fd, EV_READ,
408 ba97b2d7 2024-03-20 stsp 	    notify_dispatch_session, &session->iev);
409 ba97b2d7 2024-03-20 stsp 	gotd_imsg_event_add(&session->iev);
410 ba97b2d7 2024-03-20 stsp 	add_session(session);
411 ba97b2d7 2024-03-20 stsp 
412 ba97b2d7 2024-03-20 stsp 	return NULL;
413 ba97b2d7 2024-03-20 stsp }
414 ba97b2d7 2024-03-20 stsp 
415 ba97b2d7 2024-03-20 stsp static void
416 ba97b2d7 2024-03-20 stsp notify_dispatch(int fd, short event, void *arg)
417 ba97b2d7 2024-03-20 stsp {
418 ba97b2d7 2024-03-20 stsp 	struct gotd_imsgev *iev = arg;
419 ba97b2d7 2024-03-20 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
420 ba97b2d7 2024-03-20 stsp 	ssize_t n;
421 ba97b2d7 2024-03-20 stsp 	int shut = 0;
422 ba97b2d7 2024-03-20 stsp 	struct imsg imsg;
423 ba97b2d7 2024-03-20 stsp 
424 ba97b2d7 2024-03-20 stsp 	if (event & EV_READ) {
425 ba97b2d7 2024-03-20 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
426 ba97b2d7 2024-03-20 stsp 			fatal("imsg_read error");
427 ba97b2d7 2024-03-20 stsp 		if (n == 0) {
428 ba97b2d7 2024-03-20 stsp 			/* Connection closed. */
429 ba97b2d7 2024-03-20 stsp 			shut = 1;
430 ba97b2d7 2024-03-20 stsp 			goto done;
431 ba97b2d7 2024-03-20 stsp 		}
432 ba97b2d7 2024-03-20 stsp 	}
433 ba97b2d7 2024-03-20 stsp 
434 ba97b2d7 2024-03-20 stsp 	if (event & EV_WRITE) {
435 ba97b2d7 2024-03-20 stsp 		n = msgbuf_write(&ibuf->w);
436 ba97b2d7 2024-03-20 stsp 		if (n == -1 && errno != EAGAIN)
437 ba97b2d7 2024-03-20 stsp 			fatal("msgbuf_write");
438 ba97b2d7 2024-03-20 stsp 		if (n == 0) {
439 ba97b2d7 2024-03-20 stsp 			/* Connection closed. */
440 ba97b2d7 2024-03-20 stsp 			shut = 1;
441 ba97b2d7 2024-03-20 stsp 			goto done;
442 ba97b2d7 2024-03-20 stsp 		}
443 ba97b2d7 2024-03-20 stsp 	}
444 ba97b2d7 2024-03-20 stsp 
445 ba97b2d7 2024-03-20 stsp 	for (;;) {
446 ba97b2d7 2024-03-20 stsp 		const struct got_error *err = NULL;
447 ba97b2d7 2024-03-20 stsp 
448 ba97b2d7 2024-03-20 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
449 ba97b2d7 2024-03-20 stsp 			fatal("%s: imsg_get error", __func__);
450 ba97b2d7 2024-03-20 stsp 		if (n == 0)	/* No more messages. */
451 ba97b2d7 2024-03-20 stsp 			break;
452 ba97b2d7 2024-03-20 stsp 
453 ba97b2d7 2024-03-20 stsp 		switch (imsg.hdr.type) {
454 ba97b2d7 2024-03-20 stsp 		case GOTD_IMSG_CONNECT_SESSION:
455 ba97b2d7 2024-03-20 stsp 			err = recv_session(&imsg);
456 ba97b2d7 2024-03-20 stsp 			break;
457 ba97b2d7 2024-03-20 stsp 		default:
458 ba97b2d7 2024-03-20 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
459 ba97b2d7 2024-03-20 stsp 			break;
460 ba97b2d7 2024-03-20 stsp 		}
461 ba97b2d7 2024-03-20 stsp 		imsg_free(&imsg);
462 ba97b2d7 2024-03-20 stsp 
463 ba97b2d7 2024-03-20 stsp 		if (err)
464 ba97b2d7 2024-03-20 stsp 			log_warnx("%s: %s", __func__, err->msg);
465 ba97b2d7 2024-03-20 stsp 	}
466 ba97b2d7 2024-03-20 stsp done:
467 ba97b2d7 2024-03-20 stsp 	if (!shut) {
468 ba97b2d7 2024-03-20 stsp 		gotd_imsg_event_add(iev);
469 ba97b2d7 2024-03-20 stsp 	} else {
470 ba97b2d7 2024-03-20 stsp 		/* This pipe is dead. Remove its event handler */
471 ba97b2d7 2024-03-20 stsp 		event_del(&iev->ev);
472 ba97b2d7 2024-03-20 stsp 		event_loopexit(NULL);
473 ba97b2d7 2024-03-20 stsp 	}
474 ba97b2d7 2024-03-20 stsp 
475 ba97b2d7 2024-03-20 stsp }
476 ba97b2d7 2024-03-20 stsp 
477 ba97b2d7 2024-03-20 stsp void
478 ba97b2d7 2024-03-20 stsp notify_main(const char *title, struct gotd_repolist *repos,
479 ba97b2d7 2024-03-20 stsp     const char *default_sender)
480 ba97b2d7 2024-03-20 stsp {
481 ba97b2d7 2024-03-20 stsp 	const struct got_error *err = NULL;
482 ba97b2d7 2024-03-20 stsp 	struct event evsigint, evsigterm, evsighup, evsigusr1;
483 ba97b2d7 2024-03-20 stsp 
484 ba97b2d7 2024-03-20 stsp 	arc4random_buf(&sessions_hash_key, sizeof(sessions_hash_key));
485 ba97b2d7 2024-03-20 stsp 
486 ba97b2d7 2024-03-20 stsp 	gotd_notify.title = title;
487 ba97b2d7 2024-03-20 stsp 	gotd_notify.repos = repos;
488 ba97b2d7 2024-03-20 stsp 	gotd_notify.default_sender = default_sender;
489 ba97b2d7 2024-03-20 stsp 	gotd_notify.pid = getpid();
490 ba97b2d7 2024-03-20 stsp 
491 ba97b2d7 2024-03-20 stsp 	signal_set(&evsigint, SIGINT, gotd_notify_sighdlr, NULL);
492 ba97b2d7 2024-03-20 stsp 	signal_set(&evsigterm, SIGTERM, gotd_notify_sighdlr, NULL);
493 ba97b2d7 2024-03-20 stsp 	signal_set(&evsighup, SIGHUP, gotd_notify_sighdlr, NULL);
494 ba97b2d7 2024-03-20 stsp 	signal_set(&evsigusr1, SIGUSR1, gotd_notify_sighdlr, NULL);
495 ba97b2d7 2024-03-20 stsp 	signal(SIGPIPE, SIG_IGN);
496 ba97b2d7 2024-03-20 stsp 
497 ba97b2d7 2024-03-20 stsp 	signal_add(&evsigint, NULL);
498 ba97b2d7 2024-03-20 stsp 	signal_add(&evsigterm, NULL);
499 ba97b2d7 2024-03-20 stsp 	signal_add(&evsighup, NULL);
500 ba97b2d7 2024-03-20 stsp 	signal_add(&evsigusr1, NULL);
501 ba97b2d7 2024-03-20 stsp 
502 ba97b2d7 2024-03-20 stsp 	imsg_init(&gotd_notify.parent_iev.ibuf, GOTD_FILENO_MSG_PIPE);
503 ba97b2d7 2024-03-20 stsp 	gotd_notify.parent_iev.handler = notify_dispatch;
504 ba97b2d7 2024-03-20 stsp 	gotd_notify.parent_iev.events = EV_READ;
505 ba97b2d7 2024-03-20 stsp 	gotd_notify.parent_iev.handler_arg = NULL;
506 ba97b2d7 2024-03-20 stsp 	event_set(&gotd_notify.parent_iev.ev, gotd_notify.parent_iev.ibuf.fd,
507 ba97b2d7 2024-03-20 stsp 	    EV_READ, notify_dispatch, &gotd_notify.parent_iev);
508 ba97b2d7 2024-03-20 stsp 	gotd_imsg_event_add(&gotd_notify.parent_iev);
509 ba97b2d7 2024-03-20 stsp 
510 ba97b2d7 2024-03-20 stsp 	event_dispatch();
511 ba97b2d7 2024-03-20 stsp 
512 ba97b2d7 2024-03-20 stsp 	if (err)
513 ba97b2d7 2024-03-20 stsp 		log_warnx("%s: %s", title, err->msg);
514 ba97b2d7 2024-03-20 stsp 	gotd_notify_shutdown();
515 ba97b2d7 2024-03-20 stsp }
516 ba97b2d7 2024-03-20 stsp 
517 ba97b2d7 2024-03-20 stsp void
518 ba97b2d7 2024-03-20 stsp gotd_notify_shutdown(void)
519 ba97b2d7 2024-03-20 stsp {
520 ba97b2d7 2024-03-20 stsp 	log_debug("shutting down");
521 ba97b2d7 2024-03-20 stsp 	exit(0);
522 ba97b2d7 2024-03-20 stsp }